EP0244448B1 - Optisches phosphatglas mit anomaler positiver teildispersion und verfahren zu seiner herstellung - Google Patents

Optisches phosphatglas mit anomaler positiver teildispersion und verfahren zu seiner herstellung Download PDF

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Publication number
EP0244448B1
EP0244448B1 EP86906264A EP86906264A EP0244448B1 EP 0244448 B1 EP0244448 B1 EP 0244448B1 EP 86906264 A EP86906264 A EP 86906264A EP 86906264 A EP86906264 A EP 86906264A EP 0244448 B1 EP0244448 B1 EP 0244448B1
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EP
European Patent Office
Prior art keywords
amounts
content
weight
displays
oxides
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP86906264A
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German (de)
English (en)
French (fr)
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EP0244448A1 (de
Inventor
Heinz BRÖMER
Werner Huber
Norbert Meinert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leica Microsystems Holdings GmbH
Original Assignee
Wild Leitz GmbH
Leica Industrieverwaltung GmbH
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Publication date
Application filed by Wild Leitz GmbH, Leica Industrieverwaltung GmbH filed Critical Wild Leitz GmbH
Priority to AT86906264T priority Critical patent/ATE60314T1/de
Publication of EP0244448A1 publication Critical patent/EP0244448A1/de
Application granted granted Critical
Publication of EP0244448B1 publication Critical patent/EP0244448B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/12—Silica-free oxide glass compositions
    • C03C3/23—Silica-free oxide glass compositions containing halogen and at least one oxide, e.g. oxide of boron
    • C03C3/247—Silica-free oxide glass compositions containing halogen and at least one oxide, e.g. oxide of boron containing fluorine and phosphorus

Definitions

  • the application relates to an optical phosphate glass with anomalous positive partial dispersion, which is free of alkalis and calcium, and a method for its production.
  • BeF 2 beryllium fluoride
  • phosphates from groups I to 111 of the periodic table of the chemical elements are preferably used as glass formers.
  • the fluoride components are more than 50% by weight of the raw materials used. Because of this high fluoride content, it is difficult to melt larger units of these glasses without streaks.
  • Glasses are known from DE-OS 32 01 370 which, as glass formers, generally contain calcium metaphosphate (1-20% by weight) in addition to larger amounts of aluminum metaphosphate (13-39% by weight). In addition, they have a fluoride content of between 19 and 47% by weight. In addition to barium oxide, yttrium oxide and / or ytterbium oxide is also present in amounts of 1.5 to 12% by weight. Remelting of the examples given in DE-OS 32 01 370 showed that even with the smallest melting batches of about 50 g, turbidity could not be avoided when slowly stirring and the melts crystallized in some examples.
  • the task also consists in specifying a method for smear-free melting of the glass in large units.
  • the optical phosphate glass with an abnormal partial dispersion + Av. between 2.2 and 7.0 of a refractive index N. between 1.60 and 1.66 and an Abbe number v e between 65 and 55 has the following elementary composition in percent by weight (% by weight): Magnesium (Mg): 1 , 5 to 3.5; Strontium (Sr); 1.5 to 4.5; Barium (Ba): 30.0 to 47.0; Aluminum (AI): 2.5 to 5.5; Phosphorus (P): 10.0 to 16.0; Fluorine (F): 2.5 to 4.5; Oxygen (O): 24.0 to 30.0; Yttrium (Y): 0 to 7.0; Gadolinium (Gd); 0 to 13.0; Boron (B): 0 to 1.0; Zircon (Zr): 0 to 3.0; Niobium (Nb): 0 to 5.0; Tantalum (Ta): 0 to 5.0, where the F / P ratio is between
  • the object is alternatively achieved by a process for producing such a phosphate glass, specifically by melting a mixture with the following starting composition (in% by weight): magnesium metaphosphate (Mg (PO 3 ) 2 ): 12.3 to 19.3; Barium metaphosphate (Ba (P0 3 ) 2 ): 17.0 to 20.0; Aluminum metaphosphate (AI (P0 3 ) 3 ): 11.3 to 13.3, the content of alkaline earth metal metaphosphates between 29.3 and 37.3 and the total content of all metaphosphates used between 40.6 and 49.6; Magnesium fluoride (MgF 2 ): 1.0; Strontium fluoride (SrF 2 ): 2.5 to 3.6; Barium fluoride (BaF 2 ): 1.0; Aluminum fluoride (AIF 3 ): 2.5, the alkaline earth fluoride content being between 4.5 and 5.6 and the total content of all fluorides used being between 7.0 and 8.1; Strontium oxide (SrO):
  • Tables 3 and 4 below show the starting compositions of the glasses according to the invention contained in Tables 1 and 2.
  • Table 3 contains those examples which, in addition to the essential components, also have the optional components Y 2 0 3 , Gd 2 0 3 and Nb 2 0 5, individually or in combination, while Table 4 lists those examples which are given as optional components Gd 2 0 3 , B 2 0 3 , Zr0 2 , Nb 2 0 5 and Ta 2 O 5 included individually or in combination.
  • the batch is appropriately melted in a platinum crucible.
  • the procedure for performing a melt weighing 6 kg is described below.
  • the melt mixture consists of a material mixture as it is listed in Table 3 under melting example No. 1.
  • the well-mixed mixture is placed in portions in a platinum crucible, the temperature of which is 1100 to 1150 ° C.
  • the insertion time is approx. 1 hour.
  • the mixture is then brought back to about 1150 ° C. and refined for about 45 minutes while stirring at intervals. If the melt is free of bubbles, the stirring speed is reduced to approx. 80 rpm and then reduced to a casting temperature of approx. 900 ° C.
  • the melt is finally poured into steel molds preheated to approx. 550 ° C and cooled in an annealing furnace.
  • the glass is low in fluorescence and can be processed into compacts with large diameters. It is used especially for highly corrected photo lenses.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)
EP86906264A 1985-10-19 1986-10-17 Optisches phosphatglas mit anomaler positiver teildispersion und verfahren zu seiner herstellung Expired - Lifetime EP0244448B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86906264T ATE60314T1 (de) 1985-10-19 1986-10-17 Optisches phosphatglas mit anomaler positiver teildispersion und verfahren zu seiner herstellung.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3537291 1985-10-19
DE3537291 1985-10-19
DE3634675 1986-10-11
DE19863634675 DE3634675A1 (de) 1985-10-19 1986-10-11 Optisches phosphatglas mit anomaler positiver teildispersion und verfahren zu seiner herstellung

Publications (2)

Publication Number Publication Date
EP0244448A1 EP0244448A1 (de) 1987-11-11
EP0244448B1 true EP0244448B1 (de) 1991-01-23

Family

ID=25837119

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86906264A Expired - Lifetime EP0244448B1 (de) 1985-10-19 1986-10-17 Optisches phosphatglas mit anomaler positiver teildispersion und verfahren zu seiner herstellung

Country Status (3)

Country Link
EP (1) EP0244448B1 (enrdf_load_stackoverflow)
DE (2) DE3634675A1 (enrdf_load_stackoverflow)
WO (1) WO1987002351A1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02124740A (ja) * 1988-10-06 1990-05-14 Sumita Kogaku Glass Seizosho:Kk フツリン酸塩光学ガラス
US7088903B2 (en) * 2003-09-16 2006-08-08 Kabushiki Kaisha Ohara Optical glass having a small photoelastic constant
CN114804622B (zh) * 2021-01-21 2023-08-01 成都光明光电股份有限公司 近红外特殊色散玻璃

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE471354A (enrdf_load_stackoverflow) * 1946-01-29
DE1088674B (de) * 1958-06-13 1960-09-08 Jenaer Glaswerk Schott & Gen Verfahren zum Herstellen alkali- und berylliumfreier, fluoridhaltiger Phosphatglaeser
DE1596854A1 (de) * 1967-02-23 1971-03-25 Jenaer Glaswerk Schott & Gen Verwendung eines Glases als optisches Glas mit weitgehend temperaturunabhaengiger optischer Weglaenge
DE2342484B2 (de) * 1973-08-23 1977-12-29 Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar Verfahren zum herstellen eines fluorophosphatglases mit einer brechzahl n tief e groesser als 1,57, einem abbe-wert ny tief e kleiner als 70 und einer relativ hohen positiven anomalen teildispersion
JPS604145B2 (ja) * 1981-01-20 1985-02-01 株式会社ニコン 弗化物燐酸塩光学ガラス

Also Published As

Publication number Publication date
DE3677207D1 (de) 1991-02-28
DE3634675C2 (enrdf_load_stackoverflow) 1988-09-22
DE3634675A1 (de) 1987-04-23
EP0244448A1 (de) 1987-11-11
WO1987002351A1 (en) 1987-04-23

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